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arXiv 0901.3397cond-mat.supr-concond-mat.mtrl-sci
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高质量La2-xSrxCuO4单晶的浮区法生长及性能表征

Floating-zone growth and property characterizations of high-quality La2-xSrxCuO4 single crystals

Xiaoli Shen, Zhengcai Li, Caixia Shen, Wei Lu, Xiaoli Dong, Fang Zhou*, Zhongxian Zhao

摘要:

采用移动溶剂浮区法(TSFZ)生长了欠掺杂(x = 0.11,0.12)和最佳掺杂(x = 0.16)的La_(2-x)Sr_xCuO_4(LSCO)晶体。为了获得高质量的LSCO单晶,我们对制备工艺进行了优化。例如,我们采用溶胶-凝胶法制备了超细均匀的LSCO前驱体粉末,并采用了相当慢的生长速率。相当大的生长晶锭的直径通常为约6.6mm,长度为100 mm,并且没有检测到杂质相。双晶X射线摇摆曲线证实了晶体的高质量,其半高宽(FWHM)仅为113 ~ 150弧秒(或0.03度~ 0.04度),是迄今为止报道的LSCO晶体的最佳数据。根据磁性测量,铜酸盐晶体的超导临界温度(TC)对于x = 0.11为30 K,对于x = 0.12为31 K,对于x = 0.16为38.5 K。

英文摘要:

We have grown underdoped (x = 0.11, 0.12) and optimally doped (x = 0.16) La2-xSrxCuO4 (LSCO) crystals by traveling-solvent floating-zone (TSFZ) technique. In order to obtain LSCO single crystals of high quality, we have made much effort to optimize the preparation procedures. For example, we have adopted sol-gel route to prepare highly fine and homogeneous LSCO precursor powder, and used quite slow growth rate. The sizable grown crystal ingots are typically about 6.6 mm in diameter and 100 mm in length, and no impurity phases were detected. The high quality of grown crystals has been verified by double-crystal x-ray rocking curves, with full-width-at-half-maximum (FWHM) being only 113 ~ 150 arcseconds (or 0.03 deg - 0.04 deg), which are the best data reported so far for LSCO crystals. The superconducting critical temperatures (TC's) of the cuprate crystals are 30 K for x = 0.11, 31 K for x = 0.12 and 38.5 K for x = 0.16 samples according to magnetic measurements.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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